LTC4008 Linear Technology, LTC4008 Datasheet - Page 4

• Manufacturer Part Number: LTC4008
• Description: Multi-Chemistry Battery Charger
• Manufacturer: Linear Technology

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ELECTRICAL CHARACTERISTICS
LTC4008
temperature range (Note 4), otherwise specifications are at T
SYMBOL
Oscillator
f
f
DC
Gate Drivers (TGATE, BGATE)
TGTR
TGTF
BGTR
BGTF
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: See Test Circuit.
Note 3: Does not include tolerance of current sense resistor or current
programming resistor.
TYPICAL PERFOR A CE CHARACTERISTICS
4
OSC
MIN
V
V
I
d
s
gs
MAX
= 0V
= 0A
= 0
TEST PERFORMED ON DEMOBOARD
V
CHARGER = ON
I
INFET Response Time to
Reverse Current
CHARGE
IN
= 15VDC
PARAMETER
Regulator Switching Frequency
Regulator Switching Frequency in Drop Out
Regulator Maximum Duty Cycle
V
V
V
V
TGATE Transition Time
BGATE Transition Time
V
V
I
PFET (5A/DIV)
TGATE
BGATE
TGATE
BGATE
TGATE
BGATE
d
TGATE Rise Time
TGATE Fall Time
BGATE Rise Time
BGATE Fall Time
= <10mA
(REVERSE) OF
High (V
Low (V
at Shutdown (V
High
Low
at Shutdown
1.25µs/DIV
CLP
V
INFET = 1/2 Si4925DY
CLP
CHARGE
V
V
gs
s
– V
– V
OF PFET (5V/DIV)
OF PFET (2V/DIV)
TGATE
TGATE
= 12.6V
CLP
W
– V
)
)
TGATE
4008 G01
U
)
–0.05
–0.10
–0.15
–0.20
0.05
0
6
V
FB
CONDITIONS
Duty Cycle ≥ 98%
V
I
C
C
I
C
C
C
C
I
I
TGATE
BGATE
TGATE
BGATE
vs DCIN
CSP
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
The
11
A
= V
= –1mA
= 3000pF
= 3000pF
= 3000pF, 10% to 90%
= 3000pF, 10% to 90%
= 3000pF, 10% to 90%
= 3000pF, 10% to 90%
= –1µA, DCIN = 0V, CLP = 12V
= 1mA
= 1µA, DCIN = 0V, CLP = 12V
= 25°C. V
●
BAT
denotes specifications which apply over the full operating
16
DCIN (V)
Note 4: The LTC4008E is guaranteed to meet performance specifications
from 0°C to 70°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 5: Voltage accuracy includes BATMON error and voltage reference
error. Does not include error of external resistor divider.
DCIN
21
= 20V, V
26
(T
4008 G02
A
BAT
= 25°C unless otherwise noted)
= 12V unless otherwise noted.
–0.02
–0.04
–0.06
–0.08
–0.10
0.02
0
3
BATMON Offset
BATMON LOAD = 100kΩ
MIN
255
20
98
8
BATTERY VOLTAGE (V)
TYP
300
5.6
5.6
25
99
50
50
40
40
13
MAX
345
110
100
100
100
50
10
10
50
90
80
18
DCIN = 15V
DCIN = 20V
DCIN = 24V
4008 G03
UNITS
4008fa
23
kHz
kHz
mV
mV
mV
mV
ns
ns
ns
ns
%
V
V